RH7.2 --onprimary option doesn't work

["Schuster, Dan" <Dan Schuster westgroup com>]

Has any one used the --onprimary option for kickstarting RH7.2 system.
Anaconda complains and says it doesn't recognize the option and then the
install fails.  According to the RH Customization Guide, the onprimary
option should still be valid -- this is the same syntax that I have been
using since RH 6.2.

Here is the part of kickstart file that is having problems, if I remove the
--onprimary argument then the install work fine:
#Create Partitions (MB)
part / --size 3000 --grow
part swap --size 1000 --ondisk sda --onprimary 2
part /var --size 9000 --ondisk sda --onprimary 4
part /squid --size 10000 --ondisk sdb --onprimary 4 --grow

Thanks for the help.